阅读理解A
题干：Everybodylovesafatpayrise.Yetpleasureatyourowncanvanishifyoulearnthatacolleaguehasbeengivenabiggerone.Indeed,ifhehasareputationforslacking,youmightevenbeoutraged.Suchbehaviourisregardedas"alltoohuman”，withtheunderlyingassumptionthatotheranimalswouldnotbecapableofthisfinelydevelopedsenseofgrievance.ButastudybySarahBrosnanandFransdeWaalofEmoryUniversityinAtlanta,Georgia,whichhasjustbeenpublishedinNature,suggeststhatitisalltoomonkey,aswell.Theresearchersstudiedthebehaviouroffemalebrowncapuchinmonkeys.Theylookcute.Theyaregood-natured，co-operativecreatures，andtheysharetheirfoodtardily.Aboveall，liketheirfemalehumancounterparts,theytendtopaymuchcloserattentiontothevalueof“goodsandservices"thanmales.SuchcharacteristicsmakethemperfectcandidatesforDr.Brosnan'sandDr.deWaal’sstudy.Theresearchersspenttwoyearsteachingtheirmonkeystoexchangetokensforfood.Normally,themonkeyswerehappyenoughtoexchangepiecesofrockforslicesofcucumber.However,whentwomonkeyswereplacedinseparatebutadjoiningchambers，sothateachcouldobservewhattheotherwasgettinginreturnforitsrock,theirbehaviourbecamemarkedlydifferent.Intheworldofcapuchinsgrapesareluxurygoods(andmuchpreferabletocucumbers).Sowhenonemonkeywashandedagrapeinexchangeforhertoken’thesecondwasreluctanttohandhersoverforamerepieceofcucumber.Andifonereceivedagrapewithouthavingtoprovidehertokeninexchangeatall,theothereithertossedherowntokenattheresearcheroroutofthechamber,orrefusedtoacceptthesliceofcucumber.Indeed，themerepresenceofagrapeintheotherchamber(withoutanactualmonkeytoeatit)wasenoughtoinduceresentmentinafemalecapuchin.Theresearchessuggestthatcapuchinmonkeys，likehumans,areguidedbysocialemotions.Inthewild,theyareaco-operative，group-livingspecies.Suchco-operationislikelytobestableonlywheneachanimalfeelsitisnotbeingcheated.Feelingsofrighteousindignation,itseems,arenotthepreserveofpeoplealone.Refusingalesserrewardcompletelymakesthesefeelingsabundantlycleartoothermembersofthegroup.However,whethersuchasenseoffairnessevolvedindependentlyincapuchinsandhumans，orwhetheritstemsfromthecommonancestorthatthespecieshad35millionyearsago,is,asyet,anunansweredquestion.
题目：Female capuchin monkeys were chosen for the research most probably because they are_____.
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